Enantioselective synthesis of (3R,6S,7R,18R,19S)-, (3R,6S,7R,18R,19R)-, and (3R,6S,7R,18S,19R)-Quassiols A. A comment on the stereochemistry of natural quassiol A
Total synthesis of antimalarial diterpenoid (+)-kalihinol A, isolated frommarinespongeAcanthella sp., is achieved. This total synthesis involves regioselective alkylation of an epoxide, construction of a tetrahydropyran ring by iodo-etherification, construction of a cis-decalin ring by intramolecular Diels-Alder reaction, isomerization of cis-decalin to trans-decalin, and subsequent functionalization
Synthesis of 2,5-Disubstituted Tetrahydrofurans by Stereospecific Elimination−Cyclization of 1-Iodomethyl-1,5-bis-epoxides
作者:James A. Marshall、Harry R. Chobanian
DOI:10.1021/ol034509l
日期:2003.5.1
[reaction: see text] Treatment of 1-iodomethyl-1,5-bis-epoxides with zinc in refluxing ethanol affords cis or trans 2-vinyl-5-(1-hydroxyethy)-substituted tetrahydrofurans stereospecifically in high yield.